EP0184520A2 - Verfahren zum Herstellen von Formen für Schiffrümpfe und ähnliche dünne Gegenstände und so erhaltene Formen - Google Patents

Verfahren zum Herstellen von Formen für Schiffrümpfe und ähnliche dünne Gegenstände und so erhaltene Formen Download PDF

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Publication number
EP0184520A2
EP0184520A2 EP85402428A EP85402428A EP0184520A2 EP 0184520 A2 EP0184520 A2 EP 0184520A2 EP 85402428 A EP85402428 A EP 85402428A EP 85402428 A EP85402428 A EP 85402428A EP 0184520 A2 EP0184520 A2 EP 0184520A2
Authority
EP
European Patent Office
Prior art keywords
mold
resin
sheet
layer
shell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP85402428A
Other languages
English (en)
French (fr)
Other versions
EP0184520A3 (de
Inventor
Gilles Nedelec
Léon Ingouf
Daniel Cadot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Constructions Mecaniques de Normandie
Original Assignee
Constructions Mecaniques de Normandie
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Constructions Mecaniques de Normandie filed Critical Constructions Mecaniques de Normandie
Publication of EP0184520A2 publication Critical patent/EP0184520A2/de
Publication of EP0184520A3 publication Critical patent/EP0184520A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/34—Moulds or cores; Details thereof or accessories therefor movable, e.g. to or from the moulding station
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
    • B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/10—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies
    • B29C43/12—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies using bags surrounding the moulding material or using membranes contacting the moulding material

Definitions

  • the invention relates to the molding of thin pieces of the type of shell which are made of a "composite” material, that is to say composed of sheets of glass fabric or the like impregnated with resin on the one hand and the other part of filling elements such as foam bars or wooden blocks.
  • a "composite” material that is to say composed of sheets of glass fabric or the like impregnated with resin on the one hand and the other part of filling elements such as foam bars or wooden blocks.
  • these heating mats consist of thin steel tapes individually wrapped in insulating sheaths and held parallel to each other by means of glass fiber bands intertwined in these ribbons, said ribbons being mounted electrically in parallel with each other using electric current distribution bars connected to the ends of these ribbons.
  • the object of the invention is, above all, to overcome these drawbacks by making it possible to mold very large hulls, such as the hulls of boats of length greater than 10 meters, this length possibly reaching or even exceeding 50 meters.
  • the molds under consideration also include a heating mat comprising parallel thin metal strips surrounded by insulating material and electrically connected to each other and the methods of manufacturing these molds are essentially characterized according to the invention in that they are shaped on site, on a suitable rigid support, a first sheet of glass fabric or the like impregnated with resin, in that it is unrolled on this first sheet a self-adhesive metal strip provided on one of its faces, with its self-adhesive side facing the sheet, so as to form a series of parallel strands glued onto said sheet, and in that the whole is covered by a second sheet of glass cloth or the like impregnated with resin.
  • the metal strip is folded twice at 90 degrees during unwinding at the ends of the successive parallel strands so as to obtain a series of strands connected together in series according to zigzags.
  • the mold meanwhile, has the characteristics arising from the processes thus defined.
  • the metal strips which constitute the electrical resistances of its heating mat are made of lead and have a width of between 10 and 50 mm and a thickness of between 0.1 and 0.5 mm.
  • the invention includes, apart from these main provisions, certain other provisions which are preferably used at the same time and which will be more explicitly discussed below.
  • a hull 1 of a very long boat for example of length greater than 30 meters, made of "composite”.
  • the blocks 2 in question are prismatic breads of trapezoidal section individually wrapped by sheets 3 as defined above, these breads are juxtaposed side by side along their lateral faces and the assembly is inserted between two parallel sheets 3 of the above type.
  • the thickness of the shell 1 is of the order of 5 cm for a length of the order of 30 meters.
  • the calories necessary for heating the blank are brought directly against the two faces of this blank using electrically heated mats 4 applied contiguously against these two faces.
  • Said mats 4 are sheets filled with electrical resistances capable of generating calories by the Joule effect.
  • These resistors consist of flat lead strips 5 having a width of between 10 and 50 mm, preferably of the order of 25 mm and a thickness of between 0.1 and 0.5 mm, preferably of the order 0.2 mm.
  • These bands 5 extend horizontally parallel to each other, with a mutual distance which is of the order of half their width and they are connected together in series at their ends in a zigzag.
  • connection is advantageously obtained by double folding of the strip at 90 * , as seen at 5 in FIG. 3.
  • the strips 5 are inserted between two thin sheets 6 (FIG. 2) made of composite, that is to say each constituted by a glass cloth or the like embedded in a resin, said sheets 6 being applied one against the other. .
  • the strips 5 can then be available in the form of rolls, as is well known for the adhesive tapes.
  • Each heating mat 4 the thickness of which is in particular of the order of 3 mm, is resistant to the temperatures involved in molding and preferably made permeable to vapors and liquids by perforation.
  • the resin which constitutes the sheets 6 can for this purpose be a cold-polymerizable tooling resin with hardener.
  • the membrane 15 is extended at its periphery by folded edges 17 which surround the shell 1 and which are tightly assembled against the periphery of the mold.
  • This assembly is to produce a waterproof deformable pocket containing both the shell 1 and the two heating mats 4.
  • the shell to be manufactured comprises, in addition to its relatively thin running portions with parallel faces, inserts 19 having portions 20 projecting towards the interior of the hull, portions intended to subsequently constitute expectations for partitions or floors or stiffeners.
  • inserts are made of non-metallic materials, preferably using foam and / or wooden parts and glass or similar fabrics impregnated with resin.
  • said inserts 19 are enveloped over their entire extent by the various sheets constituting the counter-mold 8, and in particular by the heating mat 4 and the membrane 15 constituting this counter-mold.
  • the maximum temperature is of the order of 120 * and is reached in stages after a period of the order of 8 to 9 hours.
  • the invention is in no way limited to those of its modes of application and embodiments which have been more especially envisaged; on the contrary, it embraces all of its variants, in particular those in which the glass fabric would be replaced by a set of threads of fibers of comparable qualities such as fibers made of carbon, or else of an aramid such as that diffused under the Kevlar appellation by the cios du Pont de Nemours or that distributed under the Twaron appellation by the Akzo Company.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
EP85402428A 1984-12-07 1985-12-06 Verfahren zum Herstellen von Formen für Schiffrümpfe und ähnliche dünne Gegenstände und so erhaltene Formen Withdrawn EP0184520A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8418764A FR2574341B1 (fr) 1984-12-07 1984-12-07 Perfectionnements aux procedes et dispositifs de fabrication des coques et pieces minces analogues et aux pieces ainsi fabriquees
FR8418764 1984-12-07

Publications (2)

Publication Number Publication Date
EP0184520A2 true EP0184520A2 (de) 1986-06-11
EP0184520A3 EP0184520A3 (de) 1987-08-26

Family

ID=9310376

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85402428A Withdrawn EP0184520A3 (de) 1984-12-07 1985-12-06 Verfahren zum Herstellen von Formen für Schiffrümpfe und ähnliche dünne Gegenstände und so erhaltene Formen

Country Status (2)

Country Link
EP (1) EP0184520A3 (de)
FR (1) FR2574341B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999035888A1 (en) * 1998-01-09 1999-07-15 Ceramitech, Inc. Electric heating device
US6146576A (en) * 1994-08-08 2000-11-14 Intralaminar Heat Cure, Inc. Method of forming advanced cured resin composite parts

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE464514B (sv) * 1989-03-20 1991-05-06 Diab Barracuda Ab Saett att tillverka baatskrov av plast i sandwichkonstruktion

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA674309A (en) * 1963-11-19 D. Napier And Son Limited Electrical surface heaters
US2418438A (en) * 1944-11-17 1947-04-01 Vilas E Watts Method for producing curved laminated structures
US2714567A (en) * 1952-10-17 1955-08-02 Pittsburgh Plate Glass Co Preliminary pressing of bent laminated glass
GB765709A (en) * 1953-09-02 1957-01-09 William Olgilvie Hay Improved room electric heater
GB863928A (en) * 1958-08-04 1961-03-29 Norsk Eswa As Improvements in room heating elements
DD98416A1 (de) * 1971-07-30 1973-06-12
GB1386894A (en) * 1972-10-13 1975-03-12 Statni Vyzkumny Ustav Textilni Method of producing an electrically heated sheet
GB1366148A (en) * 1972-11-08 1974-09-11 Wredden J V H Electrical panel heater
US3964958A (en) * 1973-01-24 1976-06-22 Johnston Orin B Heat bonding device
FR2228589A2 (en) * 1973-05-07 1974-12-06 Aerospatiale Heating blanket for curing mould lay ups from both faces - to reduce cure temp. cycles and differentials
FR2251151A1 (en) * 1973-11-09 1975-06-06 Triplet Albert Electrically heater plate for incubation chamber - has resistance wire embedded in plastics sheet
DE2650859C3 (de) * 1976-11-06 1979-10-04 Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen Verfahren zur Herstellung von Großbauteilen aus faserverstärktem Kunststoff und Einrichtung zur Durchfuhrung des Verfahrens
DE3015998C2 (de) * 1980-04-25 1983-05-19 Messerschmitt-Bölkow-Blohm GmbH, 8000 München Anordnung zur Beheizung großflächiger Laminatformkörper
NO146836C (no) * 1980-10-10 1982-12-22 Standard Tel Kabelfab As Elektrisk varmeelement.
FR2552012B1 (fr) * 1983-09-19 1986-12-12 Aerospatiale Procede de fabrication d'un moule pour realiser des pieces moulees de grandes dimensions en materiau composite, moule obtenu au moyen de ce procede et piece polymerisee obtenue au moyen de ce moule

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6146576A (en) * 1994-08-08 2000-11-14 Intralaminar Heat Cure, Inc. Method of forming advanced cured resin composite parts
WO1999035888A1 (en) * 1998-01-09 1999-07-15 Ceramitech, Inc. Electric heating device
US6353707B1 (en) 1998-01-09 2002-03-05 Ceramitech, Inc. Electric heating ribbon with multiple coating sections attached to ribbon

Also Published As

Publication number Publication date
EP0184520A3 (de) 1987-08-26
FR2574341A1 (fr) 1986-06-13
FR2574341B1 (fr) 1987-01-16

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Inventor name: CADOT, DANIEL

Inventor name: INGOUF, LEON

Inventor name: NEDELEC, GILLES